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Nine years after 9/11, a photo provides some peace

A Danish businessman took this photo of Gary Box as he rushed toward the attacks on the World Trade Center.

STORY HIGHLIGHTS

Gary Box died on 9/11 without speaking to family; his remains were not recovered

Visit to Tribute Center prompts family to look for photos of him from that day

Search yields picture of the firefighter running through a tunnel toward attacks

Box's father meets Danish businessman who took picture: "I think I told him I love you"

New York (CNN) -- Judson Box has never known exactly how his son, Gary, died on September 11, 2001. But an unexpected find nine years later has given him a glimpse into his son's final hours.

Gary, then 35, had been working as a firefighter in Brooklyn for roughly five years when the terrorists attacked. He did not speak to his father the day of the attack and his body was never recovered, leaving the circumstances of his death a mystery.

On September 11, 2009, Gary's sister, Christine, was visiting the Tribute Center when an employee asked her if she was looking for someone specifically. She mentioned her brother Gary, and the employee showed her to a picture of a firefighter in the Brooklyn Battery Tunnel that had a caption bearing Gary's name.

But it was not Gary. It was a photo of Brian Bilcher, another member of Gary's fire squad who also perished on 9/11.

The discovery compelled Gary's father to dig deeper, clinging to the possibility that there could be a similar picture of his son out there.

Box scoured photo archives of the National 9/11 Museum and the memorial's website, which allows users to upload photos from 9/11 directly to the site.

After searching one night for more than five hours, Box went to sleep, physically and emotionally exhausted. The next morning, his wife, Helen, called him into the living room as he was eating breakfast.

She showed him a photo of a firefighter running through the Brooklyn Battery Tunnel toward the Towers alongside cars stuck in traffic.

This time, it was Gary.

"I was out of out control, emotionally," Box said. "Thanking God, being so happy that I had something to see."

Eager for more answers, Box contacted the National 9/11 Museum and Memorial in an attempt to track down the photographer. Several months later, the museum gave him the e-mail address of Erik Troelson, a Danish businessman who was stranded in the tunnel on his way to a meeting when he snapped the picture of Gary.